<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .clearfix::after{
            content: '';
            display: block;
            clear: both;
            width: 0;
            height: 0;
            font-size: 0;
        }
        body{
            margin: 0;
        }
        .page{
            width: 1000px;
            /* min-height: 900px; */
            margin: auto;
            /* border: 1px solid #000; */
        }
        .page>div{
            border: 1px solid #000;
            margin: 2px;
        }
        .page .header{
            height: 120px;
        }
        .page .body .l{
            width: 200px;
            min-height: 500px;
            background-color: #f00;
            float: left;
        }
        .page .body .r{
            width: 200px;
            min-height: 500px;
            background-color: #00f;
            float: left;
        }
        .page .body .c{
            width: 594px;
            min-height: 1000px;
            float: left;
            background-color: #0f0;
        }
        .page .footer{
            min-height: 100px;
        }
    </style>
</head>
<body>
    <div class="page">
        <div class="header">
        </div>
        <div class="body clearfix">
            <div class="l"></div>
            <div class="c"></div>
            <div class="r"></div>
        </div>
        <div class="footer"></div>
    </div>
</body>
</html>